MDSEQ (10-digit signed integer)

MDSEQ (10-digit signed integer)

Sequence number of logical message within group.
Sequence numbers start at 1, and increase by 1 for each new logical message in the group, up to a maximum of 999 999 999. A physical message which is not in a group has a sequence number of 1.
This field need not be set by the application on the MQPUT or MQGET call if:

On the MQPUT call, PMLOGO is specified.
On the MQGET call, MOSEQN is not specified.

These are the recommended ways of using these calls for messages that are not report messages. However, if the application requires more control, or the call is MQPUT1, the application must ensure that MDSEQ is set to an appropriate value.
On input to the MQPUT and MQPUT1 calls, the queue manager uses the value detailed in Table 31. On output from the MQPUT and MQPUT1 calls, the queue manager sets this field to the value that was sent with the message.
On input to the MQGET call, the queue manager uses the value detailed in Table 16. On output from the MQGET call, the queue manager sets this field to the value for the message retrieved.
The initial value of this field is one. This field is ignored if MDVER is less than MDVER2.